Attachment plug for electric heating devices



March 15, 1932. M. w. MCARDLE ET A1. 1,849,239

ATTACHMENT PLUG FOR `ELECTRIC HEATING DVICES original Filed Feb. 1o, 1927A QM 22j' cm Zei/f ZZLOIQZ ez s.

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Patented Mar. 15, 1932 Wazaa serrer; GFFHCE Miene wjraonnn, onroaed,j iiitn esoneri Bnownrne, or wrnMnTTE,1LLINoIs, AssrGNons .To cHIcAeojrLnxrnnn snA'FT contraria/or carcasa.' runners, A

Conrons'rron'or rjrinrnojrsy I nTTAom/IEN'T frLUG non' @ELECTRIC 4HEATING -Dnvrcns i original application mearebrury1o,.1927,isria1 No. 167,108. Divided ana-this applicati@ inea- June his applicationgis-.a diyision oiviourpending applicationSerial- No.. 16,1,08.iled February 10,'1927..-

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The purpose :ot the! present invention is to provide an, 4improved constructionbi .an attachment plugV of the .typadesigned for 11S@ with portable electricaldeviees, such as -lie'aters, toaster stoves. iat;-iions; andtheflike, having in combination withtheiattachment plug a control switch including. afsnap action arranged for ready removal and-replacement it' occasion should require, theispeciic. pur-4 pose of the inventiony being-.vto-:renderrsueh construction simple and economical :bo'th rin the manufacture olf: the pants-and'infthe as-l sembly of them. Theinvention .consistsfin the elements and f 'features o'rconstruction shown vand described--; as i. indicated -fin='; the Claims. I 2 'li vi,"A If Figure 1 is atop planv view. of a `plug-em'- bodying this invention disconneeted'roni the electrical device which it serves;

Figure 2 is a-partly sectional.side'elevation: of the same.

Figure 3 is a section Figure 1. y f. f:

Figure 4 is a section atthe line"4"-:4 on` Figure2. f

Figure 5 Figure 4.

Figure 6 is a detail section at the line 6-6 on Figure 5.

Referring to the drawings in detail:

The Contact elements are housed in a nietallic shell, 1, from which the cable, 2, containing' lead vires, 3 and 4, emerges at one side and extends in a coiled metallic sheath, 6, which is bent at right angles, as indicated, so vthat when the plug mounted on an electric fiatiron, the cable, 2, will trend rearwardly und upwardly in a plane which is laterally offset from that of the handle of the iron, out of the Way of the operator. v

At the lower end the shell is formed with apertures, 12, 12. through which are admitted the Contact prongs (not shown) of the electric appliance with which the plug is used. suitable provision being made for insulating the at the 'i343 Von 'isa 'sectionat-'ftheline 5 5 on prongs from the shell at the edges of the apex`- tures. through .whilrthe prongs protrude into the. .shellffor gmgaging the contactgmembeis within the .latteng Each ofthese contacts oonsistsioftwdgmetal par,ts,.15 and 16, formed ang,l ,arrange d, maybe readily` understood from the drawings without detaildescription, for being stressed toward each othergto grip between them and. Iobtain sure contact withsthe.insertedprongs.,4 v f Oneo the Contact members, l,16,carriesa binding screw, 26,-' to whichkthe lead'Wire, 3, is directly,attached.l The other lead wire4, isl connectedby. a. bindin screw, .27, ,to a ,lug, 28a, of the tting,l2 8,. anc?, ored'o'n .an insulating sheet, 18, and havngan upI-'standing contact Vlug,:29,; forengaging with a swinging switch. arm, 3Q,V which is electrically connected with. the other contact member, 16. Said arm, lx3Q, is pivotedat 31Y to asupport, 38, extending, from the under side of the part, 16, as seen inl Figurel 3, .said supportbeing clamped in position by securement--o the part, 16, tosaidinsulating sheet, 18..

.The 4switch. arm, :30,4 has spacedgupturned lugs, 33, atitsmovableend, one 0f. said lugs serving for: contact with the part, 29, 'and the space 'between said .lugs .accommodating `an actuator in the form of a'U-shaped lever, 34, which :is a partof a snapaction assembly carried in a' cap` block, 35. This block is of insulatingl material, being molded in a form to serve ,for fa. convenient finger grip in applying orwithdrawing the plug from-the electrical idevice which it serves; and' the block, 35,v is secured tothe upper -end .of the shell, 31,in la manner to permit of its easy removal therefrom', which may be understood from the drawings and requiring no specific description for the purpose of the present invention. f

Nithin the cap block, 35, the snap action for operating theswitch arm, 30, is secured by transverse screws, 42, whose heads are slightly sunken to avoid danger of shortcirc-uiting, .and which extend through a U- shaped mounting frame, 43, accommodated in .a suitable recess in the cap block, 35, and entered therein from the under or inner side. A rocking lever, 44, is pivoted at in said frame, 43, said lever having its two arms,

46, 46, engaged respectively with push buttons, 47 and 48, which are slidably carried in suitable ports in the block, 35. The frame, 43, has'out-turned lugs, 49, which-serve. as pivots-for a swinging actuator member, 34 which engages the switch arm, 30; and reacting between the lower end of said actumember comprising a. member which projects through the topy surface of the cap.

5. In the combination defined in claim 2, salidf'channeled member. approximately Ulshapedv` with its parallel arms channeled --for-the said locking engagement, and with a .lugon itsconnecting portion projecting par.-

ator, 34,. andl a yoke at the end ,y'offtheshrffalllx ,to .side the' shell'or inserting middle arm, 50,'of the lever, 44,'a spring, 51', on a guide stem, 52, stresses the parts to hold "br wittcwi'ngfthUlshaped.parti 6. An attachment/plug comprisinga shell them at one limit or the other of. their rangezanertilredt incendio admit Contact prongs,

of movement, and acts to carry them past and a removable cap block serving as a clothe middle` position -when lonerorthe other of :i thenlother end fof shell contact the buttons, 47 or 48, is depressed. The devicesffor co-operatlng with contact prongs;

actuator, 34, being merely inserted between the lugs, 33, of the lever, 34,' it is readily withdrawn when tl'iecap block, 45,'isremoved; andV if thesnap ac tion lshould lrequire repair, it can be removed from the block upon withdrawing the screws, 42, which hold the frame,

43; in place. 'We'claim v "1 1;"'In an attachment plug, a' shellf apertured at one end.toi:receive',contactc prongs, yielding Contact f devices' housed' 'in the' shell, afcontact member; a .,movabl as' socia'tedv with'one of said` devices, circuit wires enteringl 'thefshellffand :attached re."- s'pectively totheother ctact deviceand'to said' contact 'niemben said Jcontact `'member being arranged' to co-olp'erate withI said switch arm, and acaI'J-m'eml "er removably secured tothe opposite end of the she'lhasnap action device and actuating means thereormoiuit ed in said "cap, said snap action device com pris'ing a" part eitending intov engagement with Ithe'switchfarm'. 'I

2. In an' attachmentl plug, ya shell aper tured at' one end 13o-receive contactv prongs, yielding contact devices housed in the'sh'e'll, a movable switch member lmounted in' the shell, and a removable ycap lblock serving asI a closure forth-e other'er'fd of the shell, with switch-actuating means carried by said block having `v`a vpart extending for engagement with the movable switch member in the shell, said shell having laterallyprojecting flanges at the end which receives the capI block, and

y the block having grooves in its sidesadjacent said ianges and a channeled locking member laterally slidable lover the flanges of the shell and simultaneously engageabl'e with the grooves of the block for locking the latter in place.

3. In the combination defined lin claiml, said cap member having downwardly taper ing lateral surfaces adapting it to serve as anger grip for withdrawing the shell endwise from the contact prongs.v

In the combination defined in claim 1,'said cap member having downwardly taperingl lateral surfaces adapting it to serve as a. finger grip for withdrawing the shell endwise from the Contact prongs, and the actuating means of the snap action in said cap switch means controlling circuit connection bet-'green' fthe contactndevices fcomprising a snap action-'switch mounted in'said' shell and cap block, and exteriorily operable-switchopejating means'carried 'lby' the cap member, said cap mem'herhav'ingdownwardly tapering lateral surfaces` adapting'- it to serve as a .finger grip forwithdrawing the shell end'- wi'se fromthe contactprongs. -v

7; n-v attachment plug' comprising 'a shell apertured -atf'one end to admit Contact prongs, and a.I removable cap-'blockserving as a clo-l sure for 'the'otlier end of the shell Contact devices'for cooperating vwith contact prongs; switch 'meansf'controlling circuit connectionbetweenfthe contact' devices comprising a snap action switch mounted in said shellfand cap'i block, and e'xterioxlyi'operable switchoperatingl means carried by the cap member, said can member having downwardlytapering lateral surfaces adapting it to 4serve as a finger grip for'withdrawingth'e shell end- Wiserom the contact prongs, and the actuating means of'thesnap-action m said cap member comprising; a: member which projects through the top surface of the cap.

testinirywhereof, we have hereunto set our hands at Chicago, Illinois, this 26th fdayof-Jwnei 1930.V n v MICHAEL W. MCARDLE. i GEORGE. BROWNING. 

